rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (12 ticks this GP) idle=2bec/1/0x4000000000000000 softirq=764/766 fqs=146
rcu: (detected by 0, t=10002 jiffies, g=1053, q=2041 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 624 Comm: syz.3.90 Not tainted syzkaller #0 0043dfd2fbaf315da186ee57f2b2b1c8bfff300f
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:-1 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x26c/0x2a0 mm/kasan/generic.c:189
Code: eb 28 4f 8d 5c 33 01 eb 21 4f 8d 5c 33 02 eb 1a 4f 8d 5c 33 03 eb 13 4f 8d 5c 33 04 eb 0c 4f 8d 5c 33 05 eb 05 4f 8d 5c 33 06 <4d> 89 dd 4d 85 db 0f 84 51 ff ff ff 4d 01 d1 4d 39 cd 75 11 41 83
RSP: 0018:ffffc9000dc5fbf8 EFLAGS: 00000002
RAX: f300f204f1f1f101 RBX: ffffffffffffffff RCX: ffffffff858dcbf2
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff889e9040
RBP: ffffc9000dc5fc20 R08: ffffffff889e9043 R09: 1ffffffff113d208
R10: dffffc0000000000 R11: fffffbfff113d208 R12: dffffc0000000000
R13: 0000000000000001 R14: fffffbfff113d209 R15: 1ffffffff113d208
FS: 000055557bd68500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8a396e7d60 CR3: 0000000113f3a000 CR4: 00000000003526b0
Call Trace:
__kasan_check_write+0x18/0x20 mm/kasan/shadow.c:37
instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1300 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:111 [inline]
do_raw_spin_lock include/linux/spinlock.h:187 [inline]
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
_raw_spin_lock_irqsave+0xa2/0x150 kernel/locking/spinlock.c:162
vga_put drivers/pci/vgaarb.c:547 [inline]
vga_arb_release+0x20f/0x950 drivers/pci/vgaarb.c:1455
__fput+0x1fe/0xa00 fs/file_table.c:429
____fput+0x20/0x30 fs/file_table.c:457
task_work_run+0x1e3/0x250 kernel/task_work.c:240
resume_user_mode_work+0x36/0x50 include/linux/resume_user_mode.h:50
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x64/0xb0 kernel/entry/common.c:218
do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f8a3898ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff1e26cee8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 0000000000008e2e RCX: 00007f8a3898ebe9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f8a38bb7da0 R08: 0000000000000001 R09: 0000000e1e26d1df
R10: 0000001b2df20000 R11: 0000000000000246 R12: 00007f8a38bb5fac
R13: 00007f8a38bb5fa0 R14: ffffffffffffffff R15: 00007fff1e26d000
rcu: rcu_preempt kthread starved for 9709 jiffies! g1053 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:0 pid:18 tgid:18 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
schedule_timeout+0x139/0x3a0 kernel/time/timer.c:2619
rcu_gp_fqs_loop+0x2f2/0x12f0 kernel/rcu/tree.c:2053
rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:2255
kthread+0x2c7/0x370 kernel/kthread.c:389
ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244